/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: ElemCopyOf.java 468643 2006-10-28 06:56:03Z minchau $
*/
package org.apache.xalan.templates;
import javax.xml.transform.TransformerException;
import org.apache.xalan.res.XSLTErrorResources;
import org.apache.xalan.transformer.TransformerImpl;
import org.apache.xalan.transformer.TreeWalker2Result;
import org.apache.xml.dtm.DTM;
import org.apache.xml.dtm.DTMIterator;
import org.apache.xml.dtm.ref.DTMTreeWalker;
import org.apache.xalan.serialize.SerializerUtils;
import org.apache.xml.serializer.SerializationHandler;
import org.apache.xpath.XPath;
import org.apache.xpath.XPathContext;
import org.apache.xpath.objects.XObject;
/**
* Implement xsl:copy-of.
* <pre>
* <!ELEMENT xsl:copy-of EMPTY>
* <!ATTLIST xsl:copy-of select %expr; #REQUIRED>
* </pre>
* @see <a href="http://www.w3.org/TR/xslt#copy-of">copy-of in XSLT Specification</a>
* @xsl.usage advanced
*/
public class ElemCopyOf extends ElemTemplateElement
{
static final long serialVersionUID = -7433828829497411127L;
/**
* The required select attribute contains an expression.
* @serial
*/
public XPath m_selectExpression = null;
/**
* Set the "select" attribute.
* The required select attribute contains an expression.
*
* @param expr Expression for select attribute
*/
public void setSelect(XPath expr)
{
m_selectExpression = expr;
}
/**
* Get the "select" attribute.
* The required select attribute contains an expression.
*
* @return Expression for select attribute
*/
public XPath getSelect()
{
return m_selectExpression;
}
/**
* This function is called after everything else has been
* recomposed, and allows the template to set remaining
* values that may be based on some other property that
* depends on recomposition.
*/
public void compose(StylesheetRoot sroot) throws TransformerException
{
super.compose(sroot);
StylesheetRoot.ComposeState cstate = sroot.getComposeState();
m_selectExpression.fixupVariables(cstate.getVariableNames(), cstate.getGlobalsSize());
}
/**
* Get an int constant identifying the type of element.
* @see org.apache.xalan.templates.Constants
*
* @return The token ID for this element
*/
public int getXSLToken()
{
return Constants.ELEMNAME_COPY_OF;
}
/**
* Return the node name.
*
* @return The element's name
*/
public String getNodeName()
{
return Constants.ELEMNAME_COPY_OF_STRING;
}
/**
* The xsl:copy-of element can be used to insert a result tree
* fragment into the result tree, without first converting it to
* a string as xsl:value-of does (see [7.6.1 Generating Text with
* xsl:value-of]).
*
* @param transformer non-null reference to the the current transform-time state.
*
* @throws TransformerException
*/
public void execute(
TransformerImpl transformer)
throws TransformerException
{
try
{
XPathContext xctxt = transformer.getXPathContext();
int sourceNode = xctxt.getCurrentNode();
XObject value = m_selectExpression.execute(xctxt, sourceNode, this);
SerializationHandler handler = transformer.getSerializationHandler();
if (null != value)
{
int type = value.getType();
String s;
switch (type)
{
case XObject.CLASS_BOOLEAN :
case XObject.CLASS_NUMBER :
case XObject.CLASS_STRING :
s = value.str();
handler.characters(s.toCharArray(), 0, s.length());
break;
case XObject.CLASS_NODESET :
// System.out.println(value);
DTMIterator nl = value.iter();
// Copy the tree.
DTMTreeWalker tw = new TreeWalker2Result(transformer, handler);
int pos;
while (DTM.NULL != (pos = nl.nextNode()))
{
DTM dtm = xctxt.getDTMManager().getDTM(pos);
short t = dtm.getNodeType(pos);
// If we just copy the whole document, a startDoc and endDoc get
// generated, so we need to only walk the child nodes.
if (t == DTM.DOCUMENT_NODE)
{
for (int child = dtm.getFirstChild(pos); child != DTM.NULL;
child = dtm.getNextSibling(child))
{
tw.traverse(child);
}
}
else if (t == DTM.ATTRIBUTE_NODE)
{
SerializerUtils.addAttribute(handler, pos);
}
else
{
tw.traverse(pos);
}
}
// nl.detach();
break;
case XObject.CLASS_RTREEFRAG :
SerializerUtils.outputResultTreeFragment(
handler, value, transformer.getXPathContext());
break;
default :
s = value.str();
handler.characters(s.toCharArray(), 0, s.length());
break;
}
}
// I don't think we want this. -sb
// if (transformer.getDebug())
// transformer.getTraceManager().fireSelectedEvent(sourceNode, this,
// "endSelect", m_selectExpression, value);
}
catch(org.xml.sax.SAXException se)
{
throw new TransformerException(se);
}
}
/**
* Add a child to the child list.
*
* @param newChild Child to add to this node's child list
*
* @return Child just added to child list
*/
public ElemTemplateElement appendChild(ElemTemplateElement newChild)
{
error(XSLTErrorResources.ER_CANNOT_ADD,
new Object[]{ newChild.getNodeName(),
this.getNodeName() }); //"Can not add " +((ElemTemplateElement)newChild).m_elemName +
//" to " + this.m_elemName);
return null;
}
/**
* Call the children visitors.
* @param visitor The visitor whose appropriate method will be called.
*/
protected void callChildVisitors(XSLTVisitor visitor, boolean callAttrs)
{
if(callAttrs)
m_selectExpression.getExpression().callVisitors(m_selectExpression, visitor);
super.callChildVisitors(visitor, callAttrs);
}
}